OL shouldn't effect mid range AFR's. The only time OL would effect AFR is if you max your trims and run lean due to a lack of fuel.
Make sure you downloaded the correct aggressive beta. There are two versions. One for pump fuel and one for e85 mix. If you have access to e85 and you're going to the strip I would recommend running the e85 tune so you can run higher boost and timing advance. Make sure you follow the directions because if you're not on the correct firmware you can have issues like this with the map you're running.
Just an FYI, if you run the e85 tune, make sure you're tank is low and put 7 to 8 gal of e85 in and then top off with premium. Drive about a mile before putting your car into map1. It will take that long for the ethanol level in your fuel to increase to the injectors. Make sure you do three to four 3rd gear pulls at WOT before logging to allow adaptation.
Log 3rd gear from 2500 rpm with traction and stability disabled. Make sure your pulls run into 4th gear for a bit to get the transition from third to fourth gear. Once you see everything is in order, start moving your start boost up by 5 and log your run to make sure everything looks good. You should be able to run your start boost to 100% if everything looks good, but again take it slow because you may need to make a few other changes along the way if you start maxing trims or having timing issues.